JPS617040A - Shock absorber for forging machine - Google Patents

Abstract

PURPOSE:To improve the forging efficiency of said machine by providing spring adjusting mechanism to the spring retainer of a shock absorber using springs provided successively between the couplings of both transmission shafts on a motor side and chuck side of a forging machine and adjusting the evergizing force corresponding to the operation cycle of forging. CONSTITUTION:The springs 19a, 19b having different spring constants are dissposed in series to a case 20 of the shock absorber or the springs 29a, 29b having different lengths are disposed in parallel. The spring adjusting mechanism for the springs 19a, 19b or 20a, 29b consisting of a spring retainer 21, press plate 22 and nut 23 is then provided. The spring energizing force by the springs for shock absorbtion is adjusted to the optimum state to meet the operation cycle in the state of forging.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a shock absorber that is connected and interposed between a motor-side transmission shaft and a chuck-side transmission shaft in a forging machine, and that transmits rotational torque and reduces impact between the two transmission shafts. It is related to the device.

As shown in Fig. 3, a conventional example of the buffer device in a forging machine includes a motor (11), a transmission shaft (2) on the motor side that is rotationally driven by the motor (11) and transmits rotational torque, and a transmission shaft (2) on the chuck side. 4) A shock absorber (3) that is connected and interposed between the transmission shafts (2) and (4) to transmit rotational torque and reduce impact.
, a chuck (5) attached to the tip side of the transmission shaft (4),
The forging machine is composed of a hammer (6) for forging a workpiece (α) (material to be forged) held by a chuck (5), and the buffer device (3) is shown in FIGS. 4 and 5. As shown in FIG. A spring (
a spring retainer (11) which is slidably combined with the case a0 and is connected to the protrusions (7, 7) of the coupling (7α) with pins (8); Furthermore, the stopper (15) is attached to the coupling (7h).
is provided, and the coupling (7) is connected by the stopper a9.
The maximum elongation span l (distance between pins (8) and (8)) between the case (it) and the spring retainer αυ by receiving the protrusion (7'a) on the α) side [is limited, and the transmission shaft (2) (4) can be rotated relative to each other in only one direction under spring bias (from the above span! position, the transmission shaft (2) and coupling (7α) rotate to the left in the illustration, and the transmission shaft (4) and coupling (7h) rotate to the right. The rotational torque of the transmission shaft (2), which is rotationally driven in the direction of the arrow (A) by the motor (11), is transferred by the coupling (
7α), spring holder (11), spring (9),
The workpiece held by the chuck (5) is transmitted in the order of case Q east coupling (7b) and transmission shaft (4).
Forging is performed by rotating the workpiece (α) and intermittently hitting it with a continuously rotating workpiece (α) hammer (6).
When the workpiece (cL) is being struck by the hammer (6), that is, when forging force is being applied, the tip of the workpiece is struck by the hammer (6).
), a large torsion acts on the workpiece and a shock is applied to the chuck side, but this shock is applied to the case (10) and the spring retainer ( II), or in other words, the relative rotation of coupling (7h) with respect to coupling (7α), the spring biasing force is relieved and the workpiece (α) is prevented from twisting.

In addition, in place of the stopper QS, a coupling (7α
) and (7h) may be provided with a connecting rod or the like that is only extendable and retractable.

Further, in the conventional shock absorbing device, the spring (
If the spring constant of 9) is excessive, the hammer (6)
When the rotational torque is in contact with the workpiece (α), the rotational torque transmitted to the chuck side varies greatly and causes twisting of the workpiece.If it is too little, the chuck side with respect to the motor side during the striking process. The spring constant of the spring (9) is set so that it does not become too large or too small, because the relative rotation of the chuck becomes too large and the rotation delay on the chuck side cannot be recovered by the next blow, causing a major problem in forging. Furthermore, there is an appropriate operation cycle range between the rotational speed of the workpiece (α) and the number of cycles (number of times per second) of striking by the hammer (6), and generally the rotational speed and the number of cycles are There is a proportional relationship between the rotation speed and the rotation speed of the spring (9). ) the operating cycle range is limited by the spring constant.

In addition, if the natural torsional frequency of the system determined by the spring constant of the spring (9) and the rotational inertia moments of the motor and chuck sides coincides with the cycle described above, a resonance phenomenon will occur and the rotational amplitude will increase, so consideration should be given to this as well. is necessary.

As mentioned above, in conventional shock absorbers for forging machines, the spring constant of the shock absorbing spring is set in advance and the spring biasing force is specified based on the above conditions. The number of revolutions of the workpiece and the number of striking cycles, that is, the range of reasonable operating cycles, are severely limited, and there are problems with the diversification of forging that corresponds to the workpiece (forged object), that is, versatility, and the need for shock absorbing springs. There are drawbacks such as forging performance is significantly reduced due to fatigue and other problems, and there are problems with reliability.

The present invention has been developed in view of the above-mentioned circumstances, and the first aspect of the present invention is to connect couplings that are fixed to the connection ends of both the transmission shafts on the motor side and the chuck side. A shock absorber comprising a case having a spring and a spring retainer slidably combined with the case, and in which both the transmission shafts are interlocked and connected so as to be relatively rotatable in only one direction under spring bias. It is characterized in that springs with a spring constant are arranged in series, and a spring adjustment mechanism for the spring is provided on the spring holder, so that the spring biasing force can be adjusted to correspond to the operating cycle of forging.
In the second invention, in the shock absorbing device, springs of different lengths are arranged in parallel in the case, and a spring adjustment mechanism for the springs is provided by using the spring presser υ, so that the spring urging force corresponding to the forging operation cycle is adjusted. It is characterized by an adjustable configuration, and its purpose is to arrange springs with different spring constants in series in the case, or arrange springs with different lengths in parallel, By providing a spring adjustment mechanism for the spring in the spring holder and making it possible to adjust the spring biasing force corresponding to the forging operation cycle, the forging operation cycle (number of revolutions of the workpiece, number of striking cycles) K can be adjusted. The present invention provides a shock absorbing device for a forging machine that can adjust the spring biasing force of a shock absorbing spring to an optimal state, significantly improves forging performance, diversifies forging, improves reliability, and eliminates the above-mentioned drawbacks of the conventional forging machine. It is in.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

FIG. 1 shows an embodiment of the present invention, and in the figure (7/a
, ) is a projection fixed to the connection end of the transmission shaft (2) on the motor side, and (7/h) is a projection fixed to the connection end of the transmission shaft (4) on the chuck side. , the projection (7'Q) of the coupling (7h) on the transmission shaft (4) side has a pin (
8), the case (A) housing the springs (19α) and (19b) is connected in series, and the projection on the coupling (7α) on the transmission shaft (21 side)
A spring holder (2I) slidably assembled inside the spring holder (2I) is connected to the spring holder (2I) by a pin (8) K.
9d) and (19h) have different spring constants,
A stopper (1) is slidably arranged inside the case (20).
The springs (19σ) and (19h) are arranged in series (C arrangement) due to the intervention of the support plate 06) of 6α) fl, and the spring holder (21) also has a spring (19/+) at the tip. Holding plate (22 is fitted, and the holding plate (Near for adjusting forward and backward movement of 27J) (23+
is screwed on so that it can be adjusted forward and backward, and the spring (19cz
) is configured with a spring adjustment mechanism.

The embodiment of the present invention shown in FIG.
1,9a) spring constant y, k□, spring (19h
) is 2, the springs (19α) and (19b) are arranged in series in the state shown in Figure 1.
l et al.'s /ζne (= J force acts, so it is Z
.

Therefore, the spring constant of the two springs (19a) (19/l) is 1° to 2/(k 1 + 2)
The weaker spring (19ff) will roar and become even weaker than the weaker spring (19ff).
α) is greatly deflected, that is, shortened, and the stopper (16σ) hits the bottom of the case @), and the spring (19a) loses its effectiveness, and only the strong spring (19h) becomes effective, resulting in a strong spring constant and force. .

Assuming that the actual number of forging cycles is from A cycle to C cycle, for example, in low operation from A cycle to B cycle, the time from one forging to the next forging, that is, the striking interval, is relatively long, and even a relatively weak spring can be used. The rotation delay on the chuck side can be recovered, and the torsional natural frequency i
It is necessary to keep the value below A psi, but in this case, the first one where both springs (19α) and (19h) act
The weak spring biasing force (spring constant) in the state shown in the figure is appropriate, and on the other hand, in high cycle operation from B cycle to C cycle, it is necessary to recover the rotation delay on the chuck side in a short time because the striking interval is short. In addition, in this case, it is okay for the torsional natural frequency to fall into the low cycle region, so a stronger spring than in the low cycle operation is desirable.In this case, screw the nut (23+ to the left in the figure) and tighten the spring (19tZ).
By substantially killing the current and activating only the spring (tqh) and increasing the spring constant, that is, the spring biasing force, a state suitable for high cycle operation can be achieved. Also, 2 of the above explanation
In addition to adjusting the spring constant of the embodiment, the initial spring biasing force can also be finely adjusted by adjusting the amount of tightening of the spring by the nut and presser plate.

As mentioned above, the spring constant and spring biasing force can be adjusted extremely easily by adjusting the nut and holding plate (/'C), that is, the spring adjustment strip structure, and the buffering performance can be adjusted at any time to match the operating cycle of forging. Therefore, even if the forging operation cycle is changed depending on the workpiece, that is, the object to be forged, the optimum buffering state can always be achieved by the above adjustment, and forging performance and reliability are significantly improved.

Furthermore, FIG. 2 shows another embodiment of the present invention, in which the projection (7h) on the coupling (7h) on the transmission shaft (4) side
'b) connected to the case arm with the pin (8), the transmission shaft (2
) side of the coupling (7α) with a pin (8) connected to the protrusion (7t) of the spring presser CI! I), a presser plate (2) fitted to a spring presser C21), and a presser plate (2) screwed to the spring presser Ql) so that it can move forward and backward.
``For Natsu (Incorporated) etc. that adjust the advance and retreat of IJ, please refer to Part 1.
The structure is similar to that shown in the figure, and in this example, two springs (29α) and (29α) of different lengths are used.
9h) are arranged in parallel in the case (A), and one end of the springs (29α) and (29h) are both fixed to the bottom of the case 4.

When the two springs (29α) and (29b) of different lengths are arranged in parallel inside the case holder as described above, the outer spring can be tightened by tightening the retaining plate (22) toward the spring side using the nut (c). (29h) only, or outer and inner springs (29A) and (2
It is possible to adjust the additive spring constant of both springs (29b) and (9α), so that only the outer spring (29b) is activated during low-cycle operation, and the spring (29b) and (29b) are activated during high-cycle operation.
29α), and the same effects as in the first embodiment can be obtained.Furthermore, in this embodiment, the support plate (Le in FIG. 1) is not required, and the case can be simplified. (4) The length can be shortened and the performance of springs (29h) and (29α) can be maximized.

In addition, in the case of FIG. 1, an example was explained in which springs with different spring constants were used, but the same effect can be achieved even if springs with different spring constants are used, and a strong spring (19α) , weak spring (19
It is also possible to use h), and in Figures 1 and 2, the case where two springs are used is explained.
It is also possible to have three or more.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a shock absorber of a forging machine showing one embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing another embodiment of the invention, and FIG. 3 is a mechanical diagram of the forging machine. FIG. 4 is a longitudinal sectional view showing a conventional shock absorber, and FIG. 5 (4) (B) is a perspective view showing a coupling between the motor side and the chuck side. 2.4: Transmission shaft 7a, 7b: Cup link 7'α,
7'h: Protrusion 194.19b#29ff, 29
b: Spring 20: Case 21 Spring presser foot 22: Holder plate 23: Nut sub-agent Patent attorney Shige Okamoto 3 people outside the kiln ν

Claims (2)

[Claims] (1) Consists of a case with a spring connected between couplings fixed to the connecting ends of both the transmission shafts on the motor side and the chuck side, and a spring holder slidably attached to the case. , a shock absorber in which both the transmission shafts are interlocked and connected so as to be relatively rotatable in only one direction under spring bias,
The case is characterized in that springs with different spring constants are arranged in series, and the spring holder is provided with a spring adjustment mechanism for the spring, so that the spring biasing force can be adjusted to correspond to the operating cycle of forging. Shock absorber for forging machine. (2) Consists of a case with a spring connected between couplings fixed to the connecting ends of both the transmission shafts on the motor side and the chuck side, and a spring holder slidably attached to the case. , a shock absorber in which both the transmission shafts are interlocked and connected so as to be relatively rotatable in only one direction under spring bias,
springs of different lengths are arranged in parallel in the case,
A shock absorbing device for a forging machine, characterized in that the spring holder is provided with a spring adjustment mechanism for the spring, so that the spring biasing force can be adjusted to correspond to a forging operation cycle.